Feasibility and Efficacy of the Addition of Heart Rate Variability Biofeedback to a Remote Digital Health Intervention for Depression.

This remained marginally significant when controlling for engagement with other intervention practices, despite an increase in multicollinearity (b = 0.64, P = 0.053).

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Relative to the standard group, participants in the enhanced group completed more CBT/BAT exercises (t(94) = 2.59, P = 0.01) and more psychoeducational videos (t(94) = 2.80, P = 0.01), but spent less time meditating (mean difference = 2.33 h, t(94) = − 1.61, P = 0.11), though the latter did not reach statistical significance (likely due to substantial individual variation in hours spent meditating; range = 0—29.2 h).

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